<?php

/**
 * @file
 * Contains the block display plugin.
 */

/**
 * The plugin that handles a block.
 *
 * @ingroup views_display_plugins
 */
class views_plugin_display_block extends views_plugin_display {

    function option_definition() {
        $options = parent::option_definition();

        $options['block_description'] = array('default' => '', 'translatable' => TRUE);
        $options['block_caching'] = array('default' => BLOCK_NO_CACHE);

        return $options;
    }

    /**
     * The default block handler doesn't support configurable items,
     * but extended block handlers might be able to do interesting
     * stuff with it.
     */
    function execute_hook_block($op = 'list', $delta = 0, $edit = array()) {
        if ($op == 'list') {
            $delta = $this->view->name . '-' . $this->display->id;
            $desc = $this->get_option('block_description');

            if (empty($desc)) {
                $desc = t('@view: @display', array('@view' => $this->view->name, '@display' => $this->display->display_title));
            }
            return array(
                $delta => array(
                    'info' => $desc,
                    'cache' => $this->get_cache_type()
                )
            );
        }
    }

    /**
     * The display block handler returns the structure necessary for a block.
     */
    function execute() {
        // Prior to this being called, the $view should already be set to this
        // display, and arguments should be set on the view.
        $info['content'] = $this->view->render();
        $info['subject'] = filter_xss_admin($this->view->get_title());
        if (!empty($this->view->result) || $this->get_option('empty') || !empty($this->view->style_plugin->definition['even empty'])) {
            return $info;
        }
    }

    /**
     * Provide the summary for page options in the views UI.
     *
     * This output is returned as an array.
     */
    function options_summary(&$categories, &$options) {
        // It is very important to call the parent function here:
        parent::options_summary($categories, $options);

        $categories['block'] = array(
            'title' => t('Block settings'),
        );

        $block_description = strip_tags($this->get_option('block_description'));
        if (empty($block_description)) {
            $block_description = t('None');
        }

        if (strlen($block_description) > 16) {
            $block_description = drupal_substr($block_description, 0, 16) . '...';
        }

        $options['block_description'] = array(
            'category' => 'block',
            'title' => t('Admin'),
            'value' => $block_description,
        );

        $cache_type = $this->get_option('block_caching');
        if (empty($cache_type)) {
            $cache_type = BLOCK_NO_CACHE;
        }

        $types = $this->block_caching_modes();
        $options['block_caching'] = array(
            'category' => 'block',
            'title' => t('Caching'),
            'value' => $types[$this->get_cache_type()],
        );
    }

    /**
     * Provide a list of core's block caching modes.
     */
    function block_caching_modes() {
        return array(
            BLOCK_NO_CACHE => t('Do not cache'),
            BLOCK_CACHE_GLOBAL => t('Cache once for everything (global)'),
            BLOCK_CACHE_PER_PAGE => t('Per page'),
            BLOCK_CACHE_PER_ROLE => t('Per role'),
            BLOCK_CACHE_PER_ROLE | BLOCK_CACHE_PER_PAGE => t('Per role per page'),
            BLOCK_CACHE_PER_USER => t('Per user'),
            BLOCK_CACHE_PER_USER | BLOCK_CACHE_PER_PAGE => t('Per user per page'),
        );
    }

    /**
     * Provide a single method to figure caching type, keeping a sensible default
     * for when it's unset.
     */
    function get_cache_type() {
        $cache_type = $this->get_option('block_caching');
        if (empty($cache_type)) {
            $cache_type = BLOCK_NO_CACHE;
        }
        return $cache_type;
    }

    /**
     * Provide the default form for setting options.
     */
    function options_form(&$form, &$form_state) {
        // It is very important to call the parent function here:
        parent::options_form($form, $form_state);

        switch ($form_state['section']) {
            case 'block_description':
                $form['#title'] .= t('Block admin description');
                $form['block_description'] = array(
                    '#type' => 'textfield',
                    '#description' => t('This will appear as the name of this block in administer >> site building >> blocks.'),
                    '#default_value' => $this->get_option('block_description'),
                );
                break;
            case 'block_caching':
                $form['#title'] .= t('Block caching type');

                $form['block_caching'] = array(
                    '#type' => 'radios',
                    '#description' => t("This sets the default status for Drupal's built-in block caching method; this requires that caching be turned on in block administration, and be careful because you have little control over when this cache is flushed."),
                    '#options' => $this->block_caching_modes(),
                    '#default_value' => $this->get_cache_type(),
                );
                break;
        }
    }

    /**
     * Perform any necessary changes to the form values prior to storage.
     * There is no need for this function to actually store the data.
     */
    function options_submit(&$form, &$form_state) {
        // It is very important to call the parent function here:
        parent::options_submit($form, $form_state);
        switch ($form_state['section']) {
            case 'block_description':
                $this->set_option('block_description', $form_state['values']['block_description']);
                break;
            case 'block_caching':
                $this->set_option('block_caching', $form_state['values']['block_caching']);
                $this->save_block_cache($form_state['view']->name . '-' . $form_state['display_id'], $form_state['values']['block_caching']);
                break;
        }
    }

    /**
     * Block views use exposed widgets only if AJAX is set.
     */
    function uses_exposed() {
        if ($this->use_ajax()) {
            return parent::uses_exposed();
        }

        return FALSE;
    }

    /**
     * Save the block cache setting in the blocks table if this block allready
     * exists in the blocks table. Dirty fix untill http://drupal.org/node/235673 gets in.
     */
    function save_block_cache($delta, $cache_setting) {
        if ($bid = db_fetch_object(db_query("SELECT bid, cache FROM {blocks} WHERE module = 'views' AND delta = '%s'", $delta))) {
            db_query("UPDATE {blocks} set cache = %d WHERE module = 'views' AND delta = '%s'", $cache_setting, $delta);
        }
    }

}
